Ubuntu Security Notice USN-766-1 – It was discovered that acpid did not properly handle a large number of connections. A local user could exploit this and monopolize CPU resources, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/77062/USN-766-1.txt
Source: https://packetstormsecurity.com/files/77062/Ubuntu-Security-Notice-766-1.html